Blowpipe apparatus.



G. W. HOPKINS.

BLOWPIPE APPARATUS.

APPLICATION FILED MAY 1,1908.

Patented Mar. 7, 1911.

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BLOWPIPE APPARATUS.

APPLIOATION FILED MAY 1,1908.

Patented Mar. '7, 1911.

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' GEGRGE W. HOPKINS, OF CLEVELAND, OHIO.

BLOWPIPE APPATUS.

To all whom "it may concern:

Be it known that l, GEORGE W. HOPKINS, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Blowpipe Apparatus, of which the following is a specification.

In blow pipes and burners using gases generally it is very common practice to are range them in a manner such that a mixtureof fuel and air or in other words an explosive mixture, is formed within the device itself, a feature which is'very disastrous in blow pipes generally and particularly in acetylene blow pipes for the reason that the flame is constantly firing back into the burner unless sufiicient pressure is placed upon the acetylene or upon the air or oxygen both of which proceedings are attended with considerable danger and numerous disadva-ntages.

This invention therefore relates generally to blow pipe apparatus and particularly to those adapted for using acetylene as a fuel.

More specifically however the invention relates to a blow pipe arranged to use acetylene as fuel and provided with means whereby oxygen or other combustion sup porting mediumlnay be supplied to and mixed with such fuel to raise the temperature of the flame.

Still more specifically however the invention relates to a blow pipe arranged to produce an acetylene flame and provided with means whereby mixed oxygen and air may be incorporated in the burning mixture to raise the temperature of the flame and wherein'the proportion of air and oxygen may bevaried to the greatest nicety.

Invention also resides in thearrangementof the parts of the blow pipe in a manner such that an explosive mixture may not be formed within-the blow pipe and yet at the same time a mixture may be formed which will. produce the proper combustion.

The invention may also he" said to consist in arranging a blow pipe of this type in a manner such that the gaseous fuel is projected through a contracted opening at the end-of the burner and around a nozzle extending beyond the same and through which the combustion supporting medium is supplied.

The invention may be further briefly summarized as consisting in the arrangement .tpecification of Letters Patent.

Application filed May 1, 1908. Serial No. 430,337.

Patented Mar. 19ft.

and combination of parts hereinafter set forth in the following description, drawings and claims.

.Referring tothe drawings Figure 1 is a side elevation of my improved blow pipe; Fig. 2 is a vertical longitudinal section through the same showing the air, gas and oxygen inlets; Fig. 3 is a longitudinal sectional view showing the water jacketing of the nose of the blow pipe and the water supply connections; Fig. i is a half cross section and half elevation looking at the ,rear'end of the blow pipe; Fig. 5 is a diagrammatic view of the several supplies and of the blow pipe and Fig. 6 shows a form of the device wherein the dilution of the oxygen with air or the mixing of the air and oxygen is brought about outside of the blow pipe itself showing the oxygen and air mixer in section.

Any preferred form and construction of blow pipe may be employed provided it possesses the necessary features, but I have shown one construction in the drawings which meets the requirements with great efliciency and in such embodiment -1 represents a body portion provided with a central opening 2 having a hose connection 3 threaded in the rear end thereof for air and also provided with a plug 4 arranged to be screwed into the opening 2- and carrying therein a nozzle 5 provided with a tapered end portion 6 having a very small opening therein. The nozzle 5 is less in diameter than the opening 2 for permitting the fuel to flow around it.

The body portion 1 is further provided upon its front end with a threaded portion 8 adapted to receive a nose portion 9, having a contracted opening 9 larger throughout than the outside of the nozzle 5 and form ing a burner opening around the same and near the end thereof. By reason of the end of the nozzle projecting through the opening in and beyond the nose portion the air and oxygen is supplied inside of the gas which passes around the outside.

The nose portion is preferably (provided with an annular opening 10 adapts to form a jacket for water or other cooling medium supplied through ports 11 and 12 provided at the rear end of the blow pipe with hose connections '11 and 12 respectively. The inner portion of the nose 9 about the threaded portion 8 seats upon gasket 14 to prevent leakage at these points. The

opening 2 in the body portion 1 together with the opening 9 in the nose serve as a means for supplying gas to the burner opening of the blow pipe and such gas is supplied to such opening through a port 15 communicating with a passage 16 into which is secured a hose connection 16 at the rear end of the blow pipe.

In order to dilute or to mix air with the oxygen or to mix oxygen with air a port 17 is arranged and it communicates with the opening 2 and witha passage 1.8 having secured in the same atithe rear end of the blow pipe a hose connection 18.

From the foregoing it will be seen that as gas is supplied through the ports or openings 16 and 15 to the forward portion of the blow pipe beyond the plug 2 it will pass out around the nozzle 5 at the mouth of the burner and in order to mix with the gas, air

or oxygen or both, the operator, if he is to mix air with the gas permits such medium to flow through the ports 18 and 17 into the central opening 2 from which it will be supplied throughthe nozzle 5 within the flame or within the stream of gas. The flame then becomes very hot since a mixture of air and gas is then burningin place of pure gas. If the operator should desire to use the acetylene gas with pure oxygen he may cut off f the supply of air andpermit oxygen'alone to pass to the opening 2 when a still hotter .flame will be produced. If on the'other hand the operator should desire to use both an and oxygen with the flame these two mediums may be supplied to the blow pipe 1n any predetermined quantity and the flame will be varied accordingly in its heat intensity. i

It will be observed from the foregoing that no explosive mixture whatsoever is produced within the blow pipe and hence there can be no firing back and absolutely no danger in the use of it. The mixture if there water discharge pipe 24:.

All the valves are located upon a valve board or member 25 arranged in any convenient position and these are connected by flexible connections 26, 27, 28, 29 and 30 with the body portion 1 of the blow pipe. By this arrangement the operator may start the device by supplying gas and after this has been accomplished then turning on air until the work is heated after which oxygen maybe supplied with the air or oxygen may be delivered in the first instance and may be diluted with air. In fact, the entire apparatus is within the range of the operator so that without any great amount of skill he may manipulate the blow pipe in a manner to produce the best results.

If desired the connections 31 and 32 for air and oxygen may be led to a mixing device comprising'a casing 33 having inlets 34 and 35 for the two elements air and oxygen and a single outlet 36. This may be led to the oxygen and air connection 37 upon the body portion 1 of the blow pipe. In this arrangement the diluting ofthe oxygen or the mixing of oxygen and air is accomplished outside of the blow pipe.

It is obvious that in place of supplying air and oxygen gas to the blow pipe a supply of any combustionsupporting gas such for example as nitrous oxid may be employed with practically the same result.

One great advantage in the apphcants device is the abilityto dilute the oxygen supply or to mix air and oxygengas, for the reason that it has been found 1n practice. a crystallization is not set up" in the metal worked upon by a flame supplied with such mixture and if this mixture is not employed the crystallization is sure to take place.

Having described my invention, I claim:

1. In a blow pipe apparatus, in comb nation, a blow pipe, means for supplying gas to the same, an airsupply, an oxygen supply, means for mixing air and oxygen in any desired proportions, and means whereby said mixture may be mingled with the gas outside of the blow pipe;

2. In a blow pipe apparatus, in combination, a blow pipe, meansfor supplying a fuel gas thereto, an oxygen supply, an a1r supply, a mixing chamber communicating with said oxygen and air supplies, and means for delivering air, oxygen or both from said-mixing chamber in a manner such that all explosive mixtures are formed beyond the mouth of the blow plpe.

. 3. In a blow pipe apparatus, in comblnation, a blow pipe, a gas supply, an oxygen supply, anair supply, and means for mlxmg the oxygen and air before being mingled with the gas.

4. In a blow pipe, in combination, a discharge orifice, means for supplying a fuel gas to said blow pipe, an air supply, an oxygen supply therefor, and means whereby the air and oxygen elements may be delivered within the volume of gas passing from said orifice.

5. In a blow pipe apparatus, in combination, means for supplying gas thereto, means forsupplying oxygen to said blow pipe and additional means for supplying-airand diluting the oxygen supply.

6. In a' blow pipe apparatus, in combination, a blow pipe, a gas supply, an air supply, an oxygen supply, means whereby the oxygen and air may be mixed and means for mingling the gas and the oxygen and air element outside of the blow pipe.

7. In a blow pipe, in combination, a body portion, a delivery nose portion having an orifice, means for supplying gas to said orifice, an oxygen supply, an air supply, and means whereby the oxygen and air elements may be delivered to the flame within th volume of the gas supply thereto.

8. In a blow pipe, in combination, a body portion, a nose portion upon the same and provided with a delivery orifice, means whereby gas-may be supplied to said orifice, a nozzle portion projecting through said orifice to the outside of the nose portion, a chamber communicating with said nozzle, and means whereby air and gas may be supplied to said chamber.

9. In a blow pipe, in combination, a body portion, a noseportion secured thereto having a burner opening in the end and a contracted orifice within the nose portion and leading t9 the burner opening, an air and oxygen nozzle mounted in the body portion and having a tapered end passing centrally through. the contracted orifice and slightly out through the burner opening for delivering the air and oxygen elements inside of the gas element, a mixing chamber communicating with said nozzle, and means for supplying oxygen and air to said chamber.

10. In a blow pipe, in combination, a body portion, a nose portion upon the same and having a burner. opening and an internal contracted orifice communicating with the burner opening, a tapered nozzle mounted in the body portion and projecting out through the .burner opening in a manner such thatan annular converging passage remums about such nozzle whereby gas when supplied to such passage is directed toward a common point beyond the end of the nozzle, said body portion having air'and oxygen passageways communicating with v said nozzle.

11. In a. blow pipe, in combination, a body portion provided with connections for gas, air and oxygen and with a centrally located opening into which air and oxygen may be delivered, a tapered nozzle mounted within said central opening, a nose portion secured to said body portion and having an internal contracted opening extending through the end of the nose portion and forming a burner opening, the walls of said nose portion forming the contracted opening, being spaced at a distance from the tapered end of the nozzle and said nozzle projecting through the burner opening.

12. In a blow pipe, in combination, a body portion having a centrally located opening, air and oxygen ports communicating therewith and having also a gas opening, a plug secured in said centrally located opening between the gas supply and the air and oxygen supply ports, a nozzle mounted in said plug for the delivery of the oxygen and air and adapted to extend beyond the end of the body portion and a nose portion secured to the body portion and having a burner opening of larger diameter than the end of said nozzle and a contracted opening within forming an annular passagewayfor the gas supply about such nozzle.

13. In a blow pipe, in combination, a body portion having fuel gas and combustion supporting gas supply ports, a nose portion secured to said body portion and. provided with an opening therein adapted to form a water jacket, and said body portion having inlet and outlet passageways for water extending from said jacket to the rear end of said body portion.

14. In a blow pipe, in combination, a body portion having fuel gas and combustion supporting gas supply ports, a nose portion secured to said body portion and having a discharge orifice and an opening in such nose portion and arranged concentric with the orifice and water inlet and outlet passageways located diametrically opposite each other and extending from said opening to the rear end of the body portion whereby a stream of water may be supplied to said opening.

In testimony whereofI affix my signature in presence of two witnesses.

GEORGE W. HOPKINS.

Witnesses RAE WEISS, A. F. KwIs. 

